Somebody should build a phone unit that mimics a usb mobile internet stick in terms of network access. Buy a mobile internet plan, put the sim card into it and go crazy on VOIP/IM/whatever.
You could do this already with a netbook/notebook, headset and usb stick if you wanted but somebody with the cash (Google?) could make a smartphone-type unit easily.
been done already... sprints been selling them for a couple years now.
